General review of various methods of water and wastewater treatment

The world's water resources are limited, and according to a pessimistic view, if another world war were to break out in the world, it would be over water and access to water resources. Therefore, the preservation of available resources, as well as the optimal use of water resources, will be one of the priorities of international institutions and at the forefront of political decisions of governments. With the growth of cities and their increasing population on the one hand and the expansion of industries and factories on the other hand, the issue of environmental pollution is becoming more and more important. With the spread of machine life and the fact that people do not pay attention to everyone's interests, many types of pollution make the environment of humans and animals more unhealthy every day and expose their lives to serious danger. Thus, the issue of wastewater treatment will be vital